Indian Creek, Idaho · field elev 4,718 ft
Density Altitude at Indian Creek Usfs (S81)
From a field elevation of 4,718 ft, a typical July afternoon at Indian Creek Usfs (86 °F) raises density altitude to about 7,459 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 25.0 | 3,581 ft | 34.1 | 4,200 ft |
| February | 29.2 | 3,869 ft | 40.4 | 4,620 ft |
| March | 37.4 | 4,421 ft | 49.8 | 5,234 ft ▲ |
| April | 44.0 | 4,857 ft | 57.3 | 5,715 ft ▲ |
| May | 52.4 | 5,402 ft | 66.6 | 6,299 ft ▲ |
| June | 59.5 | 5,854 ft | 75.0 | 6,815 ft ▲ |
| July | 67.1 | 6,330 ft | 85.7 | 7,459 ft ▲ |
| August | 65.6 | 6,237 ft | 85.0 | 7,417 ft ▲ |
| September | 57.5 | 5,728 ft | 75.9 | 6,870 ft ▲ |
| October | 45.8 | 4,975 ft | 60.7 | 5,930 ft ▲ |
| November | 33.1 | 4,133 ft | 43.0 | 4,791 ft |
| December | 24.2 | 3,526 ft | 33.3 | 4,146 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for S81
DENSITY ALTITUDE caution
Field elevation 4,718 ft — the air behaves like 7,477 ft.
- PRESSURE ALT
- 4,720 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Idaho fields
- 2U8 — Thomas Creek
Stanley · elev 4,415 ft
- ID8 — Marble Creek
Challis · elev 4,685 ft
- 0U3 — Mahoney Creek Usfs
Mahoney Creek · elev 4,618 ft
- D47 — Cougar Ranch
Challis · elev 4,277 ft
- C53 — Lower Loon Creek
Challis · elev 4,200 ft
- U72 — Upper Loon Creek Usfs
Challis · elev 5,500 ft
- 3U2 — Johnson Creek
Yellow Pine · elev 4,960 ft
- 0U0 — Landmark Usfs
Landmark · elev 6,662 ft
Frequently asked questions
How high does density altitude get at S81 in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Indian Creek Usfs reaches roughly 7,459 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at S81 on an average day?
It swings with the seasons: from roughly 3,526 ft at the coldest month's average temperature to about 6,330 ft at the warmest month's — all from a constant field elevation of 4,718 ft. The month-by-month table above carries the full year.
What is the field elevation of Indian Creek Usfs?
4,718 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is S81 (FAA), in Indian Creek, Idaho.